In a residential structure, where are the highest levels of lead dust most likely to be found?

The highest levels of lead dust in a residential structure are most likely found in troughs. Troughs or horizontal surfaces, particularly those that can accumulate dust and debris, provide an environment where lead-containing particles settle over time. These areas can retain dust that may be disturbed during activities in the home, causing potential exposure.

While floors, ceilings, and countertops can also collect lead dust, troughs often go undisturbed for longer periods, allowing dust to accumulate. They can be found in places like window sills, door frames, or any horizontal surfaces where dust tends to settle. This makes troughs particularly significant in assessing lead dust risks in residential environments, especially in older homes where lead-based paints may have been used. Proper inspections in these areas are essential for accurately evaluating lead exposure risks.